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  • C07F19/00—Metal compounds according to more than one of main groups C07F1/00 - C07F17/00
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  • C08F110/00—Homopolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
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  • C08F210/00—Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
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  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
  • C08F4/619—Component covered by group C08F4/60 containing a transition metal-carbon bond
  • C08F4/61908—Component covered by group C08F4/60 containing a transition metal-carbon bond in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+
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  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
  • C08F4/619—Component covered by group C08F4/60 containing a transition metal-carbon bond
  • C08F4/61912—Component covered by group C08F4/60 containing a transition metal-carbon bond in combination with an organoaluminium compound
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  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
  • C08F4/619—Component covered by group C08F4/60 containing a transition metal-carbon bond
  • C08F4/6192—Component covered by group C08F4/60 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
  • C08F4/61922—Component covered by group C08F4/60 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not
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  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
  • C08F4/62—Refractory metals or compounds thereof
  • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
  • C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
  • C08F4/65916—Component covered by group C08F4/64 containing a transition metal-carbon bond supported on a carrier, e.g. silica, MgCl2, polymer
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  • C08F4/00—Polymerisation catalysts
  • C08F4/42—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors
  • C08F4/44—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides
  • C08F4/60—Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths or actinides together with refractory metals, iron group metals, platinum group metals, manganese, rhenium technetium or compounds thereof
  • C08F4/62—Refractory metals or compounds thereof
  • C08F4/64—Titanium, zirconium, hafnium or compounds thereof
  • C08F4/659—Component covered by group C08F4/64 containing a transition metal-carbon bond
  • C08F4/6592—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring
  • C08F4/65922—Component covered by group C08F4/64 containing a transition metal-carbon bond containing at least one cyclopentadienyl ring, condensed or not, e.g. an indenyl or a fluorenyl ring containing at least two cyclopentadienyl rings, fused or not

Definitions

• the present invention relates to a zwitterionic, neutral transition metal compound which can be advantageously used for the polymerization of olefins.
• aluminoxanes such as methylaluminoxane (MAO) as cocatalyst can be omitted while still achieving high catalyst activities.
• MAO methylaluminoxane
• Cationic alkyl complexes can be prepared by
• metallocene-alkyl compounds by protolysis of metallocene-alkyl compounds with, for example, weakly acid ammonium salts of the very stable, nonbasic tetra(pentafluorophenyl)borate anion (e.g. [PhMe 2 NH] + [B(C 6 F 5 ) 4 ] - ) or by
• Lewis acids which can be used here are salts (Ph 3 C + BR 4 - ) or strong neutral Lewis acids such as B(C 6 F 5 ) 3 .
• EP 520,732 claims a process for preparing salts of the general formula LMX + XA - according to the abovedescribed principle.
• EP 558,158 claims zwitterionic catalyst systems prepared from metallocene-dialkyl compounds and salts of the formula [R 3 NH] + [BPh 4 ] - . Reaction of such a salt with Cp* 2 ZrMe 2 generates, by means of protolysis with elimination of methane, an intermediate zirconocene-methyl cation which reacts, after C--H activation of a tetraphenylborate carbon-hydrogen bond and renewed elimination of methane, to give the zwitterion Cp* 2 Zr + -(m-C 6 H 4 )-B - Ph 3 .
• the Zr atom is here covalently bonded to a carbon atom of the phenyl ring and is stabilized via an agostic hydrogen bond.
• protolysis of a metallocene-dialkyl species with a perfluorinated [R 3 NH] + [B(C 6 F 5 ) 4 ] - salt in the first step likewise forms a cationic species, with the subsequent reaction (C--H activation) to give zwitterionic complexes (i.e. the metal atom is covalently bonded to the "former" anion) not being possible.
• This process also uses metallocenes CP 2 MR 2 in which the alkyl radicals R are cyclically bonded to one another, for example Cp 2 Zr(2,3-dimethyl-1,3-butadiene). Salts of the formula [Cp 2 Zr--R--RH] + [B(C 6 F 5 ) 4 ] - are formed after protonolysis.
• the zwitterionic complexes of the structure Cp 2 Zr + -m-C 6 H 4 B - Ph 3 have the disadvantage that the starting compounds are expensive and complicated to synthesize and have low polymerization activity.
• cationic systems of the structure [Cp 2 MR] + [RB(C 6 F 5 ) 3 ] - have very high hydrolysis sensitivities and can be used on an industrial scale only to a limited extent.
• the activities observed for these systems are low owing to the abovementioned stability problems and the presumably sometimes strong coordination of the alkyl group of the borate anion to the metal center.
• the present invention accordingly provides a zwitterionic transition metal compound of the formula I ##STR1## where L are identical or different and are each a ⁇ -ligand or an electron donor, n is equal to 1, 2, 3 or 4,
• M is a metal atom of group IIIb, IVb, Vb or VIb of the Periodic Table of the Elements
• X is a heteroatom or a hydrocarbon group having 1-40 carbon atoms
• B is a hydrocarbon group having 1-40 carbon atoms
• A is a metal atom of group Ib, IIb, IIIa, IIIb, IVa, Va, Vb, VIb, VIIb or VIIIb of the Periodic Table of the Elements,
• R 1 are identical or different and are each a perhalogenated C 1 -C 40 -hydrocarbon radical, and m is equal to 1, 2, 3, 4 or 5.
• the metal atoms M and A bonded to one another by covalent bonds via the structural elements X and B. If X is an allyl unit, the bonding of X to the metal atom X can be a ⁇ -allyl or a ⁇ -allyl bond.
• ⁇ -Ligands are preferably unsubstituted or substituted cyclopentadienyl groups such as 2-methylcyclopentadienyl, indenyl, 2-methylindenyl, 2-methyl-4-phenylindenyl, 2-methyl-4,5-benzoindenyl, 2-methyl-4,6-diisopropylindenyl, 4,5-benzoindenyl, fluorenyl, 4,7-tert-butylfluorenyl or 2-methyl-4-(2-pyridyl)indenyl.
• cyclopentadienyl groups such as 2-methylcyclopentadienyl, indenyl, 2-methylindenyl, 2-methyl-4-phenylindenyl, 2-methyl-4,5-benzoindenyl, 2-methyl-4,6-diisopropylindenyl, 4,5-benzoindenyl, fluorenyl, 4,7-tert-butylfluorenyl or 2-methyl-4-
• an electron donor is an atom of group IVa, Va, VIa or VIIa of the Periodic Table of the Elements, which can bear substituents such as C 1 -C 20 -hydrocarbon groups.
• substituents such as C 1 -C 20 -hydrocarbon groups.
• Preference is given to O, NR 4 2 , NR 4 , NR 4 3 , PR 4 2 , PR 4 , PR 4 3 , S, P(OR 4 ) 2 , P(OR 4 ) or Cl, where R 4 is C 1 -C 20 -alkyl or C 6 -C 14 -aryl.
• Two radicals L can be linked to one another via a bridge (Z).
• the bridge Z is preferably ##STR2## ⁇ BR 2 , --AIR 2 , --Ge--, --O--, --S--, ⁇ SO, ⁇ SO 2 , --NR 2 , ⁇ CO, ⁇ PR 2 or ⁇ P(O)R 2 , where R 2 and R 3 are identical or different and are each a hydrogen atom, a halogen atom, a C 1 -C 20 -alkyl group, a C 1 -C 1 -fluoroalkyl group, a C 1 -C 10 -alkoxy group, a C 6 -C 14 -aryl group, a C 6 -C 10 -fluoroaryl group, a C 6 -C 10 -aryloxy group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 7 -C 40 -alkylaryl group, a C 8 -C 40 -aryl
• Z can also link two or more identical or different groups L n M + XBA - R 1 m with one another.
• a heteroatom is any atom of the Periodic Table of the Elements with the exceptions of carbon and hydrogen. Preference is given to O, S and N.
• Hydrocarbon groups X and B can be saturated or unsaturated, linear or branched, eg. a C 1 -C 20 -alkyl group, a C 6 -C 14 -aryl group, a C 2 -C 10 -alkenyl group, a C 7 -C 40 -arylalkyl group, a C 7 -C 40 -alkylaryl group or a C 8 -C 40 -arylalkenyl group.
• R 1 is a C 1 -C 40 -hydrocarbon radical which is perhalogenated with halogen such as fluorine, chlorine, bromine or iodine, in particular a perhalogenated C 1 -C 30 -alkyl group such as trifluoromethyl, pentachloroethyl, heptafluoroisopropyl, or monofluoroisobutyl or a perhalogenated C 6 -C 30 -aryl group such as pentafluorophenyl, heptachloronaphthyl, heptafluoronaphthyl or heptafluorotolyl.
• halogen such as fluorine, chlorine, bromine or iodine
• a perhalogenated C 1 -C 30 -alkyl group such as trifluoromethyl, pentachloroethyl, heptafluoroisopropyl, or monofluoroisobutyl
• M is a metal atom of group IVb of the Periodic Table of the Elements, such as titanium, zirconium or hafnium,
• n is equal to 2
• L are identical or different and are each a substituted or unsubstituted cyclopentadienyl group, where two radicals L can be linked to one another via a bridge Z and
• X and B together form a three-membered to five-membered (C 3 -C 5 )-alkyl chain which is saturated or unsaturated and can be substituted by C 1 -C 20 -hydrocarbon radicals,
• A is a metal of group Ib, IIb, IIIa, IVa, Va, Vb of the Periodic Table of the Elements,
• R 1 are identical or different and are each a perfluorinated alkyl or aryl group having from 1 to 20 carbon atoms and
• n 2 or 4.
• M zirconium
• n is equal to 2
• L are identical or different and are each a substituted cyclopentadienyl group, where two radicals L are bonded to one another via a bridge Z, where Z is CR 2 R 3 or SiR 2 R 3 ,
• X and B together form an unsaturated four-membered (C 4 )-alkyl chain whose hydrogen atoms can also be replaced by C 1 -C 20 -alkyl groups,
• A is a boron atom
• R 1 are identical and are each a pentafluorophenyl group (C 6 F 5 ) and
• m is equal to 3.
• L, n, M, X, B, A, R 1 and m in the formulae II, III and IV are as defined in formula I and Hal is a halogen atom such as fluorine, chlorine, bromine or iodine.
• the compound of the formula IV can be reacted with Lewis acids of the formula AR 1 m in organic solvents, for example toluene, benzene, methylene chloride, carbon tetrachloride and petroleum spirit, to give the compound of the formula I.
• organic solvents for example toluene, benzene, methylene chloride, carbon tetrachloride and petroleum spirit
• novel transition metal compounds of the formula I can be isolated or directly used for further reactions.
• the compounds of the formula I can also be prepared without isolation of intermediate and end stages in a single-vessel reaction from metallocene dihalides, dianion compounds and Lewis acids and be directly used for the polymerization.
• Suitable solvents for this purpose are aliphatic or aromatic solvents, such as hexane or toluene, or halogenated hydrocarbons, such as methylene chloride, or halogenated aromatic hydrocarbons such as o-dichlorobenzene.
• a further possibility for preparing the novel compounds of the formula I comprises the formation of metallocycles of the formula IV by electrocyclic ring-closure reaction of, for example, metallocene-bisolefin complexes or metallocene-olefin-aldehyde complexes and subsequent reaction with Ar 1 m .
• the present invention also relates to a process for preparing an olefin polymer by polymerization of at least one olefin in the presence of a catalyst containing at least one transition metal compound of the formula I.
• the polymerization can be a homopolymerization or a copolymerization.
• R a and R b are identical or different and are each a hydrogen atom, a halogen atom, an alkoxy group, a hydroxy group, an alkylhydroxy group, an aldehyde group, a carboxylic acid group or a carboxylic ester group or a saturated or unsaturated hydrocarbon radical having from 1 to 20 carbon atoms, in particular from 1 to 10 carbon atoms, which can be substituted by an alkoxy group, a hydroxy group, an alkylhydroxy group, an aldehyde group, a carboxylic acid group or a carboxylic ester group, or R a and R b together with the atoms connecting them can form a one or more rings.
• olefins examples include 1-olefins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, styrene, cyclic olefins such as norbornene, vinylnorbornene, tetracyclododecene, ethylidenenorbornene, dienes such as 1,3-butadiene or 1,4-hexadiene, biscyclopentadiene or methyl methacrylate.
• 1-olefins such as ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, styrene, cyclic olefins such as norbornene, vinylnorbornene, tetracyclododecene, ethylidenenorbornene, dienes such as 1,3-butadiene or 1,4-hexa
• propylene or ethylene are homopolymerized, ethylene is copolymerized with one or more C 3 -C 20 -1-olefins, in particular propylene, and/or one or more C 4 -C 20 -dienes, in particular 1,3-butadiene, or norbornene and ethylene are copolymerized.
• the polymerization is preferably carried out at a temperature of from -60 to 300° C., particularly preferably from 30 to 250° C.
• the pressure is from 0.5 to 2500 bar, preferably from 2 to 1500 bar.
• the polymerization can be carried out continuously or batchwise, in one or more stages, in solution, in suspension, in the gas phase or in a supercritical medium.
• a prepolymerization can be carried out by means of the compound of the formula I.
• the compounds of the formula I can also be applied to a support, particularly for controlling the particle morphology.
• Suitable support materials are, for example, silica gels, aluminum oxides, solid aluminoxane or other inorganic support materials such as, for example, magnesium chloride.
• Another suitable support material is a polyolefin powder in finely divided form.
• the supported catalyst system can be resuspended as powder or still together with solvent and can be metered into the polymerization system as a suspension in an inert suspension medium.
• purification using an aluminum alkyl for example trimethylaluminum, triethylaluminum or triisobutylaluminum, is advantageous. This purification can be carried out either in the polymerization system itself or the olefin is contacted with the Al compound and subsequently separated again prior to its addition to the polymerization system.
• Hydrogen is added, if required, as molecular weight regulator and/or to increase the activity.
• the total pressure in the polymerization system is from 0.5 to 2500 bar, preferably from 2 to 1500 bar.
• the compound of the formula I is here used in a concentration, based on the transition metal, of preferably from 10 -3 to 10 -8 , particularly preferably from 10 -4 to 10 -7 , mol of transition metal per dm 3 of solvent or per dm 3 of reactor volume.
• the polymerization is carried out as a suspension or solution polymerization
• an inert solvent customary for the Ziegler low-pressure process is used.
• the polymerization is carried out in an aliphatic or cycloaliphatic hydrocarbon; examples of such solvents which may be mentioned are propane, butane, hexane, heptane, isooctane, cyclohexane, methylcyclohexane.
• a petroleum or hydrogenated diesel oil fraction can be used. It is also possible to use toluene. Preference is given to carrying out the polymerization in the liquid monomer.
• the monomers are metered in in gaseous or liquid form.
• the duration of the polymerization can be as desired, since the catalyst system to be used according to the invention has only a small fall in polymerization activity with time.
• another aluminum alkyl compound such as, for example, trimethylaluminum, triethylaluminum, triisobutylaluminum, trioctylaluminum or isoprenylaluminum can additionally be added to the reactor to stabilize the polymerization system (for example for removing catalyst poisons present in the olefin). This is added to the polymerization system in a concentration of from 100 to 0.01 mmol of Al per kg of reactor contents.
• novel compounds of the formula I are highly active catalyst components for olefin polymerization.
• the compounds were characterized using 1 H-NMR, 13 C-NMR and IR spectroscopy.
• the catalyst solution is prepared by mixing 11 mg of biscyclopentadienylzirconium( ⁇ 4 -butadiene) in 20 ml of toluene with a solution of 20.4 mg of tris(pentafluorophenyl)borane in 20 ml of toluene. 900 ml of toluene are admixed with 1 ml of a 10% strength by weight TIBA solution in toluene and subsequently with 1 ml of this catalyst solution.
• this solution is placed in an inert 1.5 dm 3 stirred reactor, heated to 70° C. and polymerization is carried out at a pressure of 7 bar of ethylene. After 2 hours, the reactor is vented, the polymer is filtered from the suspension, washed with acetone and dried for 12 hours in a vacuum drying oven. This gives 38 g of polyethylene having an M w of 297,000 g/mol and an M w /M n of 2.5 according to GPC.
• Example 5 The polymerization of Example 5 is repeated using high-purity ethylene, except that no TIBA was added. This gives 37 g of polyethylene having identical properties.
• Example 5 The polymerization of Example 5 is repeated, except that 2 ml of the catalyst solution are added and 100 ml of 1-hexene were first added to the reactor and 5 bar of ethylene were subsequently added. After 30 minutes, the reactor is vented, the polymerization is stopped using methanol and the polymer is filtered from the suspension, washed with acetone and dried for 12 hours in a vacuum drying oven. This gives 25 g of an ethylene/1-hexene copolymer containing 5.2 mol % of hexene (according to 13 C-NMR) and having an M w of 60,000 g/mol and an M w /M n of 2.6 according to GPC. The DSC melting point of the 2nd heating is 110° C.
• a 1.5 dm 3 autoclave which was thoroughly flushed with ethene beforehand, is charged with 600 cm 3 of an 85% strength by weight solution of norbornene in toluene. The solution is saturated with ethene by repeated pressurization with ethene (18 bar).
• the polymerization mixture was drained into a vessel and immediately introduced into 5 dm 3 of acetone, the mixture was stirred for 10 min and the precipitated product was subsequently filtered off.
• the filter cake was washed alternately three times each with 10% strength hydrochloric acid and acetone. It was subsequently washed to neutrality with water, the residue was slurried in acetone and filtered again.
• the polymer thus purified was dried at 80° C. for 15 hours in vacuo (0.2 bar).
• the catalyst suspension was subsequently added to the reactor, heated to the polymerization temperature of 70° C.(4° C./min) and the polymerization system was held for 1 hour at 70° C. by means of cooling. The polymerization was stopped by addition of 20 ml of isopropanol. The excess monomer was vented and residues of solvent were taken off in vacuo. This gave 850 g of liquid, atactic polypropylene.
• the catalyst activity was 8 kg of PP/(g of metallocene ⁇ h).
• the catalyst activity was 250 kg of PP/(g of metallocene ⁇ h).
• Example 10 The preparation of the catalyst suspension from Example 10 was repeated, except that 3 mg (4.8 ⁇ mol) of rac-dimethylsilanediylbis(2-methyl-4-phenyl-1-indenyl)zirconium( ⁇ .sup.4 -butadiene) dissolved in 10 cm 3 of toluene were reacted with 2.5 mg (4.9 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 10 cm 3 of toluene. The polymerization was carried out at 60° C. after adding the catalyst suspension to the reactor. The polymerization gave 2250 g of isotactic polypropylene powder.
• the catalyst activity was 750 kg of PP/(g of metallocene ⁇ h).
• Example 10 The preparation of the catalyst suspension from Example 10 was repeated, except that 10 mg (21 ⁇ mol) of rac-dimethylsilanediylbis(2-methyl-1-indenyl)zirconium( ⁇ 4 -butadiene) dissolved in 10 cm 3 of toluene were reacted with 10.7 mg (21 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 10 cm 3 of toluene.
• the polymerization gave 1900 g of isotactic polypropylene powder.
• the catalyst activity was 190 kg of PP/(g of metallocene ⁇ h).
• the catalyst activity was 110 kg of PP/(g of metallocene ⁇ h).
• a 1500 ml reactor which had been repeatedly flushed with nitrogen was charged with 1000 ml of an 85% strength by weight solution of norbornene in toluene and the solution was heated to 70° C.
• the solution was saturated with ethylene by repeated pressurization with ethylene (16 bar gauge pressure).
• 2 ml of a 20% strength triethylaluminum solution in toluene were added to the depressurized reactor in a countercurrent of ethylene and the mixture was subsequently stirred for 15 minutes.
• the catalyst mixture was added to the prepared reaction solution and an ethylene pressure of 16 bar was subsequently applied as quickly as possible. Polymerization was carried out for 2 hours at 70° C. while stirring at about 750 rpm, with the ethylene pressure being kept constant at 16 bar.
• the reactor was first vented and the reaction solution was subsequently drained into a vessel.
• the polymer was precipitated in 2500 ml of acetone and filtered after stirring for 5 minutes.
• the filter cake was repeatedly washed alternately with 10% strength hydrochloric acid and acetone. It was subsequently washed to neutrality with water and, after addition of 1000 ml of acetone, filtered.
• the powder thus purified was dried for 15 hours at 80° C. at a pressure of 0.2 bar.
• the solid is then filtered off from the solvent and washed twice with 10 ml of toluene.
• a dry 16 dm 3 reactor was flushed first with nitrogen and subsequently with propylene and charged with 10 dm 3 of liquid propylene.
• 15 cm 3 of triisobutylaluminum (20% strength in hydrocarbon, 12 mmol) were then added to the reactor and the mixture was stirred at 30° C. for 15 minutes.
• the catalyst suspension was subsequently added to the reactor, heated to the polymerization temperature of 70° C. (4° C./min) and the polymerization system was held at 70° C. for 1 hour by cooling.
• the polymerization was stopped by addition of 20 ml of isopropanol. The excess monomer was vented and solvent residues were taken off in vacuo.
• the polymerization gives 2.5 kg of isotactic polypropylene powder.
• the catalyst activity was 83 kg of PP/(g of metallocene ⁇ h).
• the reactor shows no deposits on walls or stirrer.
• a solution of 1 ⁇ mol of biscyclopentadienylzirconium( ⁇ 4 -butadiene) in 1 ml of toluene is admixed with a solution of 1 ⁇ mol of tris(pentafluorophenyl)borane in 10 ml of toluene and, after a reaction time of 15 minutes, evaporated in vacuo to a volume of 2 ml.
• 4 g of R Accurel LDPE powder in a sieve fraction of smaller than 200 ⁇ m are dried in vacuo and flushed with argon. The support powder is stirred into the catalyst solution until a homogeneous distribution is achieved.
• a dry 1.5 dm 3 stirred reactor is flushed with nitrogen to remove the oxygen and charged with 0.9 dm 3 of an inert diesel oil (bp. from 100 to 120° C.). After flushing with ethylene, it is heated to 70° C. and the catalyst is added as powder. Polymerization is subsequently carried out without additional activator at a pressure of 7 bar of ethylene. After 1 hour, the reactor is vented, the polymer is filtered from the suspension and dried for 12 hours in a vacuum drying oven. This gives 18 g of polyethylene powder having a bulk density of 0.253 kg/dm 3 and a viscosity number VN of 389 cm 3 /g. The polydispersity M w /M n is 2.6 (according to GPC). The reactor shows no deposits on walls or stirrer.
• a gas-phase polymerization of ethylene was carried out in a 2 dm 3 steel autoclave having polished walls.
• the fluidized bed was generated mechanically by means of a double-helix stirrer going around the wall, using an initial charge of 10 g of polyethylene powder as seed bed.
• Via a pressure burette first the cocatalyst (2 mmol) of triisobutylaluminum in 2 cm 3 of isopentane and subsequently 1 g of the catalyst mixture (19.2 ⁇ mol of Zr) were metered in.
• the polymerization was subsequently carried out at 8 bar partial pressure of ethylene at a temperature of 80° C. for 1 hour and ended by venting the autoclave.
• Example 10 The preparation of the catalyst suspension of Example 10 was repeated, except that 10 mg (24 ⁇ mol) of dimethylmethylene-9-fluorenylcyclopentadienylzirconium(4-butadiene) dissolved in 10 cm 3 of toluene were reacted with 12.8 mg (25 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 10 cm 3 of toluene.
• the polymerization was carried out after metering the catalyst suspension into the reactor at 60° C. The polymerization gave 900 g of syndiotactic polypropylene powder.
• the catalyst activity was 90 kg of PP/(g of metallocene ⁇ h).
• Example 10 The preparation of the catalyst suspension of Example 10 was repeated, except that 5 mg (8 ⁇ mol) of rac-dimethylsilanediylbis(2-methyl-4,6-diisopropyl-1-indenyl)zirconium(4-butadiene) dissolved in 10 cm 3 of toluene were reacted with 4.1 mg (8.1 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 10 cm 3 of toluene. The polymerization was carried out after metering the catalyst suspension into the reactor at 60° C. The polymerization gave 2100 g of isotactic polypropylene powder.
• the catalyst activity was 420 kg of PP/(g of metallocene ⁇ h).
• Example 11 The preparation of the catalyst suspension of Example 11 was repeated. The polymerization was carried out after metering the catalyst suspension into the reactor at 70° C. The polymerization gave 2800 g of isotactic polypropylene powder.
• the catalyst activity was 933 kg of PP/(g of metallocene ⁇ h).
• Example 12 The preparation of the catalyst suspension of Example 12 was repeated, except that the 16 dm 3 reactor was charged with 10 dm 3 of liquid propylene and 2.5 standard 1 of hydrogen gas. 10 cm 3 of triisobutylaluminum (20% in hydrocarbon, 10 mmol) were then added to the reactor and the mixture was stirred at 30° C. for 15 minutes. The catalyst suspension was subsequently added to the reactor, heated to the polymerization temperature of 70° C. (4° C./min) and the polymerization system was kept at 70° C. for 1 hour by cooling. The polymerization gave 3200 g of isotactic polypropylene powder.
• the catalyst activity was 320 kg of PP/(g of metallocene ⁇ h).
• Example 10 The preparation of the catalyst suspension of Example 10 was repeated, except that 2 mg (3.1 ⁇ mol) of rac-dimethylsilanediylbis(2-ethyl-4-phenyl-1-indenyl)zirconium(4-butadiene) dissolved in 5 cm 3 of toluene were reacted with 1.7 mg (3.3 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 5 cm 3 of toluene. The polymerization gave 2150 g of isotactic polypropylene powder.
• the catalyst activity was 1075 kg of PP/(g of metallocene ⁇ h).
• Example 10 The preparation of the catalyst suspension of Example 10 was repeated, except that 2 mg (2.8 ⁇ mol) of rac-dimethylsilanediylbis(2-methyl-4-naphthyl-1-indenyl)zirconium(4-butadiene) dissolved in 5 cm 3 of toluene were reacted with 1.4 mg (2.8 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 5 cm 3 of toluene. The polymerization gave 2500 g of isotactic polypropylene powder.
• the catalyst activity was 1250 kg of PP/(g of metallocene ⁇ h).
• Example 10 The preparation of the catalyst suspension of Example 10 was repeated, except that 5 mg (11.1 ⁇ mol) of rac-dimethylsilanediylbis-1-indenylzirconium( ⁇ 4 -butadiene) dissolved in 10 cm 3 of toluene were reacted with 5.7 mg (11.1 ⁇ mol) of B(C 6 F 5 ) 3 dissolved in 10 cm 3 of toluene.
• the polymerization resulted in 2200 g of isotactic polypropylene powder.
• the catalyst activity was 440 kg of PP/(g of metallocene ⁇ h).
• the catalyst activity was 8 kg of PP/g(g of metallocene ⁇ h).

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